Sir — Even after a CBI probe has been ordered into the Vyapam scam, the Opposition is still demanding Madhya Pradesh Chief Minister Shivraj Singh Chouhan’s resignation. Thus, the political motivation of the Opposition is clear: Having failed in its malicious campaign to oust either External Affairs Minister Sushma Swaraj or Rasjasthan Chief Minister Vasundhara Raje, it is now targeting another popular BJP leader. Mr Chouhan has defeated the Congress in his State for over 10 years. The Opposition is trying to destroy his incorruptible image